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        <h2>
          <span class="refentrytitle">checkbox</span>
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        <p>checkbox — 
      Sense on-screen controls.
          </p>
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      <div class="refsect1">
        <a id="idp93635888"></a>
        <h2>Description</h2>
        <p>
      Sense on-screen controls. Requires Winsound or TCL/TK.
    </p>
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      <div class="refsect1">
        <a id="idp93677280"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">kres <span class="command"><strong>checkbox</strong></span> knum</pre>
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      <div class="refsect1">
        <a id="idp93679376"></a>
        <h2>Performance</h2>
        <p>
      Note that this opcode is not available on Windows due to the implimentation of pipes on that system 
    </p>
        <p>
      <span class="emphasis"><em>kres</em></span> -- value of the checkbox control. If the checkbox is set (pushed) then return 1, if not, return 0.
    </p>
        <p>
      <span class="emphasis"><em>knum</em></span> -- the number of the checkbox. If it does not exist, it is made on-screen at initialization.
    </p>
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      <div class="refsect1">
        <a id="idp93682832"></a>
        <h2>Examples</h2>
        <p>
      Here is a simple example of the checkbox opcode. It uses the file <a class="ulink" href="examples/checkbox.csd" target="_top"><em class="citetitle">checkbox.csd</em></a>.

      </p>
        <div class="example">
          <a id="idp93684704"></a>
          <p class="title">
            <strong>Example 111. Simple example of the checkbox opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out   Audio in</span>
-odac           -iadc       <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o checkbox.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
 
<span class="oblock">instr</span> 1
  <span class="comment">; Get the value from the checkbox.</span>
  k1 checkbox 1

  <span class="comment">; If the checkbox is selected then k2=440, otherwise k2=880.</span>
  k2 <span class="op">=</span> (k1 <span class="op">==</span> 0 <span class="op">?</span> 440 <span class="op">:</span> 880)

  a1 <span class="opc">oscil</span> 10000, k2, 1
  <span class="opc">outs</span> a1, a1
<span class="oblock">endin</span>

<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>

<span class="comment">; sine wave.</span>
<span class="stamnt">f</span> 1 0 32768 10 1

<span class="stamnt">i</span> 1 0 10 
<span class="stamnt">e</span>

<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
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        <p><br class="example-break" />
    </p>
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      <div class="refsect1">
        <a id="idp93689024"></a>
        <h2>See Also</h2>
        <p>
        <a class="link" href="button.html" title="button"><em class="citetitle">button</em></a>
      </p>
      </div>
      <div class="refsect1">
        <a id="idp93691136"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: John ffitch</td>
          </tr>
          <tr>
            <td>University of Bath, Codemist. Ltd.</td>
          </tr>
          <tr>
            <td>Bath, UK</td>
          </tr>
          <tr>
            <td>September, 2000</td>
          </tr>
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        <p>
    </p>
        <p>Example written by Kevin Conder.</p>
        <p>New in Csound version 4.08</p>
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